package com.sky.service.impl;

import com.alibaba.fastjson.JSONObject;
import com.sky.constant.MessageConstant;
import com.sky.dto.UserLoginDTO;
import com.sky.entity.User;
import com.sky.exception.LoginFailedException;
import com.sky.mapper.UserMapper;
import com.sky.properties.WeChatProperties;
import com.sky.service.UserService;
import com.sky.utils.HttpClientUtil;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.HashMap;
import java.util.Map;

@Service
public class UserServiceImpl implements UserService {
  public static final String WX_LOGIN_URL = "https://api.weixin.qq.com/sns/jscode2session";

  @Autowired
  private WeChatProperties weChatProperties;
  @Autowired
  private UserMapper userMapper;


  @Override
  public User wxLogin(UserLoginDTO userLoginDTO) {
    // 调用微信接口，取得当前用户的openid
    String openid = getOpenid(userLoginDTO.getCode());

    // 判断openid是否为空，如为空则登录失败，抛出业务异常
    if(openid == null){
      throw new LoginFailedException(MessageConstant.LOGIN_FAILED);
    }

    // 判断当前用户是否新用户
    User user = userMapper.getUserByOpenid(openid);
    if(user == null){
      // 新用户自动完成注册
      user = User.builder()
        .openid(openid)
        .createTime(LocalDateTime.now())
        .build();
      userMapper.save(user);
    }
    // 返回用户对象(需要返回user表的主键id)
    return user;
  }

  private String getOpenid(String code){
    Map<String, String> map = new HashMap<>();
    map.put("appid", weChatProperties.getAppid());
    map.put("secret", weChatProperties.getSecret());
    map.put("js_code", code);
    map.put("grant_type", "authorization_code");
    String response = HttpClientUtil.doGet(WX_LOGIN_URL, map); // 返回的是一个json字符串

    JSONObject jsonObject = JSONObject.parseObject(response);
    return jsonObject.getString("openid");
  }
}
